Muscle Tissue Structure and Function

Sarcoplasm does not contain any glycogen.

Myoglobin is a red-colored protein that binds to oxygen in muscle fibers.

The sarcoplasmic reticulum stores calcium ions in a contracted muscle fiber.

The A band of a sarcomere contains thin filaments but not thick filaments.

The Z disc separates adjacent sarcomeres in muscle fibers.

Skeletal muscles are responsible for stabilizing body position.

The endomysium is the outermost layer of connective tissue surrounding the muscle.

The plasma membrane of a muscle cell is referred to as the sarcoplasm.

Muscle tissue has the ability to generate heat during contraction.

Cardiac muscle is one of the three types of muscular tissue found in the human body.

Nerve supply to skeletal muscles includes autonomic motor neurons.

Each muscle fiber in skeletal muscle contains multiple nuclei found just beneath the sarcolemma.

The perimysium surrounds individual muscle fibers in a skeletal muscle.

The M line contains overlapping actin and myosin filaments.

Acetylcholine is released by somatic motor neurons at the neuromuscular junction.

The production of muscle action potential occurs when sodium flows out of the membrane.

Calcium binds to troponin to initiate the contraction cycle.

Creatine phosphate is synthesized when the muscle is in an active state.

Each glucose molecule can produce 36 ATP molecules through aerobic respiration.

Anaerobic respiration requires oxygen to produce ATP.

Aerobic respiration provides more than 90% of the necessary ATP in activities lasting more than 10 minutes.

A motor unit comprises a single motor neuron and all the muscle fibers it innervates.

Fast-twitch fibers are associated with endurance activities and fatigue resistance.

Isotonic contractions result in the muscle changing length while producing movement.

Incomplete tetanus occurs when muscle fibers relax completely between stimuli.

Motor units that control smaller muscle fibers typically allow for greater precision and control.

Muscles generate the most force when they are too stretched and too contracted.

Lactic acid is produced from glucose during the respiration process in muscles.

Abduction refers to the movement of a limb away from the midline of the body.

The force generated by a muscle during contraction is referred to as muscle endurance.

Fatigue in muscles leads to an increase in tension over time.

Complete tetanus results in a state of maximal contraction with no relaxation between stimuli.

Circumduction involves moving a limb in a straight line.

Hyperextension occurs when a joint is moved beyond the anatomical position.

The biceps muscle is named for having three heads.

Adduction is the movement of a limb toward the midline of the body.

The quadriceps muscle contains three heads.